Are Shinohara code 70 turnouts DCC friendly?
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You have to look at the way they are constructed. Here is a picture of a code 70 left hand Shinohara: http://www.modeltrainstuff.com/Shinohara-HO-8-Left-Hand-Turnout-70-p/shn-305.htm
You can see that there are two metal yokes that connect the point rails together; one at the points; and one at the point pivot. With this arrangement both point rails and both closure rails will be the same polarity as whichever stock rail the points are touching.
Here is a link to a Walthers code 83 "DCC friendly" turnout: http://www.modeltrainstuff.com/Walthers-HO-8804-Code-83-6-Right-Turnout-p/948-8804.htm. On this turnout the throw bar is plastic, so the point rails are not connected. Also, you can see that there is not a connection at the point rail pivot between the closure rails. Also notice that there is an insulator on both sides of the frog insulating it from everything else. All of those changes make the Walthers item "DCC friendly".
Short answer: No, the Shinohara code 70 turnouts are not DCC friendly.
However, it is not divvicult to make them usable on a DCC layout. First, cut gaps in the two rails diverging away from the frog (away from the points). Second, attach feeders from your power bus to both pairs of diverging rails.